Key Materials for Electronics Manufacturing:
Comprehensive Analysis of Solder Paste Physical Properties Testing
—— How do Viscosity, Metal Content, and Particle Size Affect Welding Quality?
The physical properties of welding materials directly determine the reliability and stability of products. Earlysun Technology Co., Ltd. controls product quality with strict standards, especially in the physical property testing of solder paste, ensuring that every product meets the highest industry requirements through scientific methods and advanced equipment.
I. Viscosity Test: The "Lifeline" of Printing Process
Solder paste viscosity is a key indicator affecting printing and welding results. Earlysun Technology uses Malcom viscometers for testing, strictly following these conditions:
- • Typical Range: 80~200kcps (dynamically adjusted based on alloy type and particle size)
- • Test Conditions: 25±0.5℃ constant temperature environment
- • Standard Basis: Viscosity values must comply with IPC-J-STD-005 standards and manufacturer specifications
II. Metal Content Test: The "Golden Ratio" for Conductivity and Strength
Earlysun Technology calculates the metal proportion (weight percentage) by weighing after heating and volatilizing the flux:
- • Typical Range: 88%~92% (slightly lower for lead-free solder paste)
- • Conductivity: Metal content ≥90% ensures low resistance connection
- • Welding Strength: Insufficient metal proportion reduces shear resistance
III. Solder Powder Particle Size Test: Microscopic Determines Macroscopic Performance
Solder powder particle size directly affects solder paste printability, welding reliability, and solder joint quality. Earlysun Technology strictly implements the IPC-J-STD-005 standard:
Common Specifications:
- ► Type 3 (25~45μm): General purpose, suitable for conventional packaging like QFP/SOP
- ► Type 4 (20~38μm): High-density IC
- ► Type 5 (10~25μm): For ultra-fine pitch
Conclusion
From viscosity to particle size, from metal content to welding strength, Earlysun Technology provides reliable welding material solutions for the electronics manufacturing industry with scientific testing methods and rigorous quality control.
